先看下我的配置：

ribbon:

MaxAutoRetries: 1 #最大重試次數(shù)，當(dāng)Eureka中可以找到服務(wù)，但是服務(wù)連不上時(shí)將會(huì)重試
MaxAutoRetriesNextServer: 1 #切換實(shí)例的重試次數(shù)
OkToRetryOnAllOperations: false # 對(duì)所有的操作請(qǐng)求都進(jìn)行重試，如果是get則可以，如果是post,put等操作沒(méi)有實(shí)現(xiàn)冪等的情況下是很危險(xiǎn)的，所以設(shè)置為false
ConnectTimeout: 1000 #請(qǐng)求連接的超時(shí)時(shí)間
ReadTimeout: 1800 #請(qǐng)求處理的超時(shí)時(shí)間

hystrix:

command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 3000
#如果配置ribbon的重試，hystrix的超時(shí)時(shí)間要大于ribbon的超時(shí)時(shí)間，ribbon才會(huì)重試
#hystrix的超時(shí)時(shí)間=(1 + MaxAutoRetries + MaxAutoRetriesNextServer) * ReadTimeout 比較好，具體看需求

Ribbon超時(shí)與Hystrix超時(shí)問(wèn)題，為了確保Ribbon重試的時(shí)候不被熔斷，我們就需要讓Hystrix的超時(shí)時(shí)間大于Ribbon的超時(shí)時(shí)間，否則Hystrix命令超時(shí)后，該命令直接熔斷，重試機(jī)制就沒(méi)有任何意義了。

從上面的配置來(lái)說(shuō)，ribbon超時(shí)配置為1800，請(qǐng)求超時(shí)后，該實(shí)例會(huì)重試1次，更新實(shí)例會(huì)重試1次。

所以hystrix的超時(shí)時(shí)間要大于 (1 + MaxAutoRetries + MaxAutoRetriesNextServer) * ReadTimeout 比較好，具體看需求進(jìn)行配置。

Ribbon超時(shí)與Hystrix超時(shí)問(wèn)題，為了確保Ribbon重試的時(shí)候不被熔斷，我們就需要讓Hystrix的超時(shí)時(shí)間大于Ribbon的超時(shí)時(shí)間，否則Hystrix命令超時(shí)后，該命令直接熔斷，重試機(jī)制就沒(méi)有任何意義了。

補(bǔ)充知識(shí)：Spring Cloud Feign 第一次調(diào)用超時(shí)(Read timed out)的解決辦法

feign-client在第一次調(diào)用微服務(wù)會(huì)出現(xiàn)Read timed out異常，提示的報(bào)錯(cuò)信息：

java.net.SocketTimeoutException: Read timed out

這是由于在調(diào)用其他微服務(wù)接口前，會(huì)去請(qǐng)求該微服務(wù)的相關(guān)信息(地址、端口等)，并做一些初始化操作，由于默認(rèn)的懶加載特性，導(dǎo)致了在第一次調(diào)用時(shí)，出現(xiàn)超時(shí)的情況，解決方法主要有兩種：

第一種辦法是設(shè)置超時(shí)時(shí)間，具體設(shè)置成多少，因項(xiàng)目而異，配置如下：

# 全局關(guān)閉Hystrix超時(shí),對(duì)所有微服務(wù)有效
hystrix.command.default.execution.timeout.enabled: false

# 關(guān)閉某一個(gè)微服務(wù)的超時(shí)
hystrix.command.<serviceName>.execution.timeout.enabled: false

# 全局設(shè)置超時(shí)時(shí)間為60秒
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 60000

# 設(shè)置某一個(gè)微服務(wù)的超時(shí)時(shí)間為60秒
hystrix.command.<serviceName>.execution.isolation.thread.timeoutInMilliseconds: 60000

# 設(shè)置ribbon超時(shí)時(shí)間
ribbon:
ReadTimeout: 20000
ConnectTimeout: 20000

第二種辦法，也是比較推薦的方式，配置ribbon立即加載，此處需要注意的是，光配置立即加載是不生效的，還要配置客戶端列表，配置如下，詳細(xì)配置請(qǐng)點(diǎn)擊：

ribbon:
eager-load:
enabled: true
clients: distribution, material-product, outer-data

最后附上未開(kāi)啟立即加載時(shí)，第一次調(diào)用打印的日志：

2019-05-27 18:05:33.819|INFO|1986|http-nio-18884-exec-2|clipcloud-configuration|3752c9412075144e|3752c9412075144e|false|com.migu.clipcloud.configuration.ConfigurationServiceApplication.test1-55|time:2019-05-27 18:05:33.819
2019-05-27 18:05:33.826|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|com.migu.clipcloud.services.client.FeignHeadConfiguration.lambda$requestInterceptor$2-51|add request header for feignclient, key:cookie,value:JSESSIONID.8250e395=node08z98wvylx12lwh89c6v09qk92.node0; screenResolution=1440x900; m=2258:cmFiYml0bXE6cmFiYml0bXE%253D
2019-05-27 18:05:33.828|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|org.springframework.context.support.AbstractApplicationContext.prepareRefresh-588|Refreshing SpringClientFactory-distribution: startup date [Mon May 27 18:05:33 CST 2019]; parent: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@203dd56b
2019-05-27 18:05:33.850|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.<init>-153|JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2019-05-27 18:05:33.864|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|com.netflix.config.ChainedDynamicProperty$ChainLink.checkAndFlip-115|Flipping property: distribution.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2019-05-27 18:05:33.865|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|com.netflix.util.concurrent.ShutdownEnabledTimer.<init>-58|Shutdown hook installed for: NFLoadBalancer-PingTimer-distribution
2019-05-27 18:05:33.866|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|com.netflix.loadbalancer.BaseLoadBalancer.initWithConfig-192|Client: distribution instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=distribution,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2019-05-27 18:05:33.884|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|com.netflix.loadbalancer.DynamicServerListLoadBalancer.enableAndInitLearnNewServersFeature-222|Using serverListUpdater PollingServerListUpdater
2019-05-27 18:05:33.886|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|com.netflix.config.ChainedDynamicProperty$ChainLink.checkAndFlip-115|Flipping property: distribution.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2019-05-27 18:05:33.887|INFO|1986|hystrix-distribution-1|clipcloud-configuration|3752c9412075144e|405382c2fc629614|false|com.netflix.loadbalancer.DynamicServerListLoadBalancer.restOfInit-150|DynamicServerListLoadBalancer for client distribution initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=distribution,current list of Servers=[192.168.26.103:18887],Load balancer stats=Zone stats: {defaultzone=[Zone:defaultzone; Instance count:1; Active connections count: 0; Circuit breaker tripped count: 0; Active connections per server: 0.0;]
},Server stats: [[Server:192.168.26.103:18887; Zone:defaultZone; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 08:00:00 CST 1970; First connection made: Thu Jan 01 08:00:00 CST 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0; stddev resp time:0.0]
]}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@173441c2
2019-05-27 18:05:33.906|INFO|1986|http-nio-18884-exec-2|clipcloud-configuration|3752c9412075144e|3752c9412075144e|false|com.migu.clipcloud.configuration.ConfigurationServiceApplication.test1-57|time:2019-05-27 18:05:33.906
2019-05-27 18:05:34.888|INFO|1986|PollingServerListUpdater-0|clipcloud-configuration||||com.netflix.config.ChainedDynamicProperty$ChainLink.checkAndFlip-115|Flipping property: distribution.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647

以上這篇feign的ribbon超時(shí)配置和hystrix的超時(shí)配置說(shuō)明就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

最新評(píng)論